Funding Rate: What It Is and How It Works

How the funding rate works

A perpetual futures contract never expires, so nothing forces its price to meet the spot price on a set date. Funding does that job continuously:

• If the perp trades above the spot index, more traders want to be long than short. A positive rate makes longs pay shorts, which discourages new longs and rewards shorts until the gap narrows.
• If the perp trades below the index, the rate turns negative and shorts pay longs.

The payment is calculated on the size of each open position at the funding time:

Funding payment = position value × funding rate

For example, with a funding rate of +0.01% for the interval, a long position worth $10,000 pays $1 and a short position of the same size receives $1. A trader who closes before the funding time neither pays nor receives for that interval.

Funding is settled at fixed intervals set by each venue; many exchanges use a few fixed times a day, and some settle every hour. The money moves between traders, not to the exchange, although trading fees are charged separately.

How the rate is calculated

Methods differ by exchange, but most combine two parts:

1. an interest-rate component, reflecting the difference in borrowing costs between the two assets in the pair, often small and fixed; and
2. a premium index, measuring how far the perp's price has been above or below the spot index during the interval.

The result is usually clamped within caps so that funding cannot become extreme in one interval. Venues that list perps with no spot market compare the contract with a moving average of its own mark price instead of a spot index. Funding changes every interval, so it is always read from live data; the spot market it is measured against is shown on pages such as Bitcoin price.

What the funding rate tells you

• Strongly positive funding means longs are crowded and paying to stay in; the market is leaning bullish with leverage.
• Strongly negative funding means shorts are crowded.
• Near-zero funding means the perp is trading close to spot.

Traders watch funding together with open interest, because a crowded, leveraged market is vulnerable to a cascade of liquidations if the price moves the other way. Some strategies hold spot and short the perp to collect positive funding, the basis trade behind synthetic dollars such as Ethena's. Funding can flip quickly, so such trades carry their own risks.

For a leveraged trader, funding is a running cost or income that can add up significantly on a position held for days or weeks.